my ($ar, $x, $y, $vr, $fps);
creates new variables through each pass of the loop.
Dump [$ar, $x, $y, $vr, $fps] if /^$/;
only prints on the passes where the input is a blank line. When $_ is a blank line, the other if conditions are false, so the variables don't get popupulated.

One solution is to read a paragraph at a time. 

local $/ = '';  # Paragraph mode.

while (<DATA>) {
   my ($ar) = m|(\d+) kb/s|;
   my ($x, $y, $vr, $fps) = m|(\d+)x(\d+).*(?:(\d+) kb/s.*)?(\d+\.\d+)
+ fps|;
   Dump [$ar, $x, $y, $vr, $fps];
}

[download]

Update: Since the data is rather variable, the following might be more reliable. I also added a fix to ignore 0x12345678. 

local $/ = '';  # Paragraph mode.

while (<DATA>) {
   my ($ar   ) = m|Audio.*?(\d+) kb/s|;
   my ($x, $y) = m|(?!0)(\d+)x(\d+)|;
   my ($vr   ) = m|Video.*?(\d+) kb/s|;
   my ($fps  ) = m|(\d+(?:\.\d+)?) fps|;
   Dump [$ar, $x, $y, $vr, $fps];
}

[download]

In reply to Re: conditional regex by ikegami
in thread conditional regex by Anonymous Monk

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